Remy wasn't normally a jealous man. In fact, he hated the emotion. He wasn't one to get jealous and feeling that way irritated him because it always leaves him with a sour feeling in his chest. But when you walk in being all close and charming with another member of the team, that same sour feeling immediately fills his entire body.
His eyes narrowed into slits and his entire body was tense. His jaw was clenching so hard, you could practically hear his teeth grinding to dust. If you had seen his grip on the table, you'd feel bad for the table before he was gripping so tightly, his knuckles were white and his joints were popping. His frown was so deep, his face could've gotten stuck like that. God he hates this.
Remy desperately wanted you to be that way with him and was enraged that you could do it so easily with someone that wasn't him. He's not the guy to be possessive and jealous but... God if he didn't want you with him right now and not them. He wasn't mad at you, he could never be mad at you. He was mad because he hated this feeling. He doesn't want to be jealous, he just wants you to be his.